Droplet discharging head and image forming apparatus

Abstract

A droplet discharging head includes a passage substrate in which individual liquid chambers are formed; a plurality of piezoelectric elements formed on the passage substrate; a plurality of wirings for connecting electrodes of the plurality of piezoelectric elements and drive circuit connecting portions for being connected to a drive circuit, respectively, formed on the passage substrate; and a support substrate, formed on the passage substrate, provided with a concave portion for housing the plurality of piezoelectric elements at a surface facing the passage substrate, the support substrate being provided with an opening portion above the drive circuit connecting portions, wherein the support substrate is adhered to the passage substrate at a support substrate adhering region of the passage substrate including area where the wirings are formed, and wherein a wiring space between each adjacent wirings is formed to have a crank portion at the support substrate adhering region.

What is claimed is: 
     
       1. A droplet discharging head comprising:
 a passage substrate in which individual liquid chambers are formed; 
 a plurality of piezoelectric elements foimed on the passage substrate; 
 a plurality of wirings for connecting electrodes of the plurality of piezoelectric elements and drive circuit connecting portions for being connected to a drive circuit, respectively, found on the passage substrate; and 
 a support substrate, formed on the passage substrate, provided with a concave portion for housing the plurality of piezoelectric elements at a surface facing the passage substrate, the support substrate being provided with an opening portion above the drive circuit connecting portions, 
 wherein the support substrate is adhered to the passage substrate at a support substrate adhering region of the passage substrate including area where the wirings are formed, and 
 wherein a wiring space between each adjacent wirings is formed to have a crank portion at the support substrate adhering region. 
 
     
     
       2. The droplet discharging head according to  claim 1 ,
 wherein the wiring width of each of the wirings is wider than the wiring space between each adjacent wirings at the support substrate adhering region. 
 
     
     
       3. The droplet discharging head according to  claim 1 ,
 wherein the wiring space between each adjacent wirings is formed to have two or more crank portions at the support substrate adhering region. 
 
     
     
       4. The droplet discharging head according to  claim 1 ,
 wherein a ratio W 2 /W 1  of the wiring space W 2  between each adjacent wirings with respect to the wiring width W 1  of each of the wirings is substantially the same along the entirety of the droplet discharging head. 
 
     
     
       5. The droplet discharging head according to  claim 1 ,
 wherein the support substrate is adhered to the passage substrate by an adhesive agent, and 
 wherein the thickness of a layer of the adhesive agent above each of the wirings is thinner than the thickness of a layer of the adhesive agent at the wiring space between each adjacent wirings. 
 
     
     
       6. The droplet discharging head according to  claim 1 ,
 wherein the wiring space between each adjacent wirings at a region between the support substrate adhering region and the drive circuit connecting portion includes a portion whose wiring space is wider than that at the support substrate adhering region. 
 
     
     
       7. The droplet discharging head according to  claim 6 ,
 wherein each of the wirings is bent at an interface portion of the support substrate adhering region and the region between the support substrate adhering region and the drive circuit connecting portion. 
 
     
     
       8. The droplet discharging head according to  claim 1 ,
 wherein the crank portion of the wiring space between each adjacent wirings is formed at a region between the concave portion and the opening portion of the support substrate. 
 
     
     
       9. The droplet discharging head according to  claim 1 ,
 wherein the crank portion of the wiring space is formed at a region that does not overlap the concave portion of the support substrate. 
 
     
     
       10. An image forming apparatus comprising:
 a droplet discharging head including,
 a passage substrate in which individual liquid chambers are formed, 
 a plurality of piezoelectric elements formed on the passage substrate, 
 a plurality of wirings for connecting electrodes of the plurality of piezoelectric elements and drive circuit connecting portions for being connected to a drive circuit, respectively, formed on the passage substrate, and 
 a support substrate, formed on the passage substrate, provided with a concave portion for housing the plurality of piezoelectric elements at a surface facing the passage substrate, the support substrate being provided with an opening portion above the drive circuit connecting portions, 
 
 wherein the support substrate is adhered to the passage substrate at a support substrate adhering region of the passage substrate including area where the wirings are formed, and 
 wherein a wiring space between each adjacent wirings is formed to have a crank portion at the support substrate adhering region. 
 
     
     
       11. The image forming apparatus according to  claim 10 ,
 wherein the crank portion of the wiring space between each adjacent wirings is formed at a region between the concave portion and the opening portion of the support substrate. 
 
     
     
       12. The image forming apparatus according to  claim 10 ,
 wherein the crank portion of the wiring space is formed at a region that does not overlap the concave portion of the support substrate.